Kevin Patterson, 41, from Walkerton, was injured after firing a starburst grenade round from an AR-15 platform rifle.

The incident occurred at a private shooting range in the 3000 block of Plymouth-LaPorte Trail in Marshall County.

"The 37 millimeter starburst grenade is an aerial illumination round, similar to an aerial firework," said Conservation Officer Corporal Ashlee Jackson. The grenade detonated in the launch tube under the rifle barrel.

Kevin Patterson was transported to Methodist Hospital in Indianapolis for treatment of injuries to his arm.

The results of the investigation will be forwarded to the Federal Bureau of Alcohol, Tobacco, and Firearms for review.

Indiana Conservation Officers, Marshall County Sheriff's Department, and Indiana State Police were on scene.